A supercell thunderstorm formed near Iowa City, Iowa and moved East along Interstate 80 and produced a funnel cloud for a few minutes.
Scene 1: Funnel quickly appears near West Branch, Iowa
Scene 2: Funnel persists at half way down
Scene 3: Funnel dissipates slowly
Scene 4: Storm structure over open corn fields
Scene 5: Incredible storm structure as we crest a hill
Scene 6: A vertical pan showing the impressive storm structure
Scene 7: Wide shot of the mesocyclone